/******************************************************************************
 *  Project:		Neddle Community Edition
 *  Filename:		ExpressionExtensions.cs
 *	Created By:     Kristopher Cargile <kristopher@neddle.org>
 *  Date Created:	March 29, 2011
 * ****************************************************************************
 * IMPORTANT GNU LICENSE INFORMATION. DO NOT REMOVE THIS SECTION!
 * 
 * Neddle :: Copyright (c) 2010-2012, Cargile Technology Group, LLC
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 ******************************************************************************/

using System;
using System.Linq.Expressions;

namespace Neddle 
{
    /// <summary>
    /// ExpressionExtensions
    /// </summary>
    public static class ExpressionExtensions
    {
        /// <summary>
        /// Get Member name.
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <typeparam name="U"></typeparam>
        /// <param name="expression">The expression.</param>
        /// <returns></returns>
        public static string MemberName<T, U>(this Expression<Func<T, U>> expression)
        {
            return GetMemberName(expression);
        }

        private static string GetMemberName<T, TU>(Expression<Func<T, TU>> expression)
        {
            MemberExpression memberExpression = expression.Body as MemberExpression;
            if(memberExpression == null)
            {
                UnaryExpression unaryExpression = expression.Body as UnaryExpression;
                if(unaryExpression != null)
                {
                    memberExpression = unaryExpression.Operand as MemberExpression;
                }
            }
            if(memberExpression != null)
            {
                return memberExpression.Member.Name;
            }
            throw new ApplicationException("Member Name not found");
        }
    }
}